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U=<a href="%pathto:imop.vl_tpsu;">VL_TPSU</a>(X,Y) returns the matrix
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[ U(|X(:,1) - Y(:,1)|) ... U(|X(:,1) - Y(:,N)|) ]
[                                               ]
[ U(|X(:,M) - Y(:,1)|) ... U(|X(:,M) - Y(:,N)|) ]
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where X is a 2xM matrix and Y a 2xN matrix of points and U(r) is
the opposite -r^2 log(r^2) of the radial basis function of the
thin plate spline specified by X and Y.
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[U,dU]=vl_tpsu(x,y) returns the derivatives of the columns of U with
respect to the parameters Y. The derivatives are arranged in a
Mx2xN array, one layer per column of U.
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See also: <a href="%pathto:imop.vl_tps;">VL_TPS</a>(), <a href="%pathto:vl_help;">VL_HELP</a>().
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